Water hardness in Wolfratshausen
20.5 °dH very hard
Tap water in Wolfratshausen is very hard: 20.5 °dH (366 mg/L · 21.4 gpg · 36.6 °fH).
Source: Stadtwerke Wolfratshausen, Prüfbericht SWM Services GmbH Labor (PB-202506683) (2026-01) · data checked 2026-11-03
Range across supply zones: 357–368 mg/L.
3 supply zones — hardness varies by neighbourhood; the figure above is the median.
Hardness by district / supply zone
| °dH | mg/L | ||
|---|---|---|---|
| SW-Zentrale UG (network point, sample 2025110587) | 20.5 | 366 | very hard |
| Tiefbrunnen I (well, sample 2025110585) | 20.6 | 368 | very hard |
| Tiefbrunnen II (well, sample 2025110586) | 20 | 357 | very hard |
Stadtwerke Wolfratshausen publishes a laboratory report from November 2025 with three sampling points: two wells and one network point. The values are calculated from calcium and magnesium and give a median of 365.9 mg/L CaCO₃, ranging from 357.0 to 367.7 mg/L. The utility's web page prints a slightly lower figure, so the report is the source here. Expect heavy scale on heating elements.
German law (WRMG) uses 3 bands: soft < 8.4 °dH, medium 8.4–14 °dH, hard > 14 °dH.
Water data
| Total hardness | 20.5 °dH |
|---|---|
| Utility | Stadtwerke Wolfratshausen KöR |
How Wolfratshausen compares
- Tap water in Wolfratshausen is 78 % harder than the median of the 809 cities we track in Germany (11.5 °dH).
- By hardness it ranks 59 of 809 in Germany (1 = hardest); 93 % of these cities have softer water.
- Nearest city with clearly softer water: Unterhaching, 22 km away (16.1 °dH).
- Nearest city with clearly harder water: Ampfing, 83 km away (26 °dH).
Ranking of the hardest and softest water in Germany →
What it means at home
- Severe scale: heater elements and washing-machine heaters fail early.
- Detergent use is very high; taps and screens coat within days.
- Dishwasher at maximum salt setting.
- An ion-exchange softener is practically essential; RO for drinking water.
How much salt will you use for softening?
Yes. At this hardness a softener pays for itself through appliance life and detergent.
Descale a coffee machine or kettle about every 1 months (typical manufacturer guidance for this hardness).
Estimates for planning, not a quote. Check your appliance manual for exact settings.
Dishwasher setting in Wolfratshausen
| Brand | Setting for this water |
|---|---|
| Bosch | H05 |
| Miele | 20 °dH |
| AEG / Electrolux | 5 |
| Beko | 6th |
| Hoover | S3 |
| LG | H3 |
From each brand's manual for the model family named in the source; your model may differ, so check its manual. All brands and how to change the setting →
FAQ
Is Wolfratshausen water hard or soft?
It is very hard: 366 mg/L as CaCO₃ (21.4 gpg, 20.5 °dH). The usual bands are soft < 60, moderately hard 60–120, hard 120–180 and very hard > 180 mg/L.
Is tap water in Wolfratshausen safe to drink?
Hardness is not a health issue; it is about limescale, taste and appliances. Mains water must meet national drinking-water standards. German law (WRMG) uses 3 bands: soft < 8.4 °dH, medium 8.4–14 °dH, hard > 14 °dH.
How many grains per gallon is Wolfratshausen water?
21.4 gpg, equal to 20.5 °dH, 36.6 °fH or 366 mg/L calcium carbonate.
What dishwasher salt setting should I use in Wolfratshausen?
For 366 mg/L (20.5 °dH) check your manufacturer's table: maximum level (5–7).
Do I need a water softener in Wolfratshausen?
Yes, unless you are only passing through: scale damages appliances within a few years.
Source
Source: Stadtwerke Wolfratshausen, Prüfbericht SWM Services GmbH Labor (PB-202506683) (2026-01). Method: computed from supplier's calcium and magnesium. Stadtwerke Wolfratshausen, Prüfbericht SWM Services GmbH Labor (PB-202506683) · Outdated figure? Tell us